Proud new owner of a JD 4310. I owned a kubota L2500 for years and to be honest I was very satisfied with the tractor. It was a simply designed tractor but the tractor is bombproof. Never had one issue with.
So far I haven't owned the JD long enough to have a concrete opinion on it but so far I am pleased with the purchase. It definitely is a larger and more stout tractor but so far not impressed much with the industrial tires over the ags I had on the kubota. Those ag tires would go through anything.
Was originally looking for a full hydrostatic but this tractor came up and was too good of a deal to pass up. The main reason I ended up switching from orange to green was I needed a tractor that was a little more user friendly for the Mrs. to use. I call it her tractor because she will probably put more hours on it than I will since I work away from home so that leaves a lot of the chores to her.
The 4310 has a front mount snowblower where my kubota had a 3pt which I am certain will make the chore a whole lot easier for her to tackle. Personally I like preferred the 3pt because I always liked the ability to have the FEL available for rolling snowbanks and cleaning out the mailbox.
Overall I feel I made a good purchase so far. The dealer I worked through was fantastic. The availability of parts online seems limitless and most importantly the wife loves the tractor and is much more comfortable using it.
Im also a proud owner of an old Oliver Super55 hence the reason of my chat so I have been "green" before I ever got my JD.